Boundary clock support for ptpd

[Wolfgang Grandegger]

gnn wrote:
> On 4/15/10 15:54 , Wolfgang Grandegger wrote:
>> Hello,
>>
>> anybody listening?
>>
> 
> Yes, just a bit slow.
> 
>> Wolfgang Grandegger wrote:
>>> Hello,
>>>
>>> I'm currently evaluating ptpd-1.0.0 for IEEE1588 time syncronization
>>> with MPC8313 boards. I realized that there is an effort to support PTPv2
>>> (at http://ptpd.svn.sourceforge.net/viewvc/ptpd/branches/v2/). Could
>>> somebody give a brief status on what is already working/supported. I'm
>>> especially looking for boundary clock support (master and slave on the
>>> same board).
>> In the meantime I made some progress. I cascaded three MPC8313 boards
>> and measured jitters of +-150ns on the second and +-300ns on the third
>> board with ptpd *v1*. I will now try with v2 allowing for shorter sync
>> intervals, which should reduce the jitter significantly.
>>
>> I also found some interesting related link. Apart from the PTPDv2
>> implementation mentioned above, there is another one, especially for the
>> MPC8313, mentioned here:
>>
>> http://forums.freescale.com/t5/Other-Microcontrollers/Open-source-for-IEEE-1588-PTP-v2-supporting-MPC831x-to-be/m-p/53829;jsessionid=9DF51308EB4B68D57F509D77E77C8DD9
>> http://code.google.com/p/ptpv2d/
>>
>> As I see it, this one also lacks support for recent kernel versions
>> using the timestamping interface:
>>
>> http://lxr.linux.no/linux/Documentation/networking/timestamping.txt
>>
>> Is there already an effort supporting that generic interface in ptpd or
>> ptpdv2?
> 
> 
> I have not looked at that, but I will try to check that out.

It's used for PTP time stamping in a few netdev drivers:

http://lxr.linux.no/#linux+v2.6.33/drivers/net/igb/igb_main.c
http://marc.info/?l=linux-netdev&m=126389931509102&w=4

Wolfgang.